(71) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the (72) for designing and constructing an improved system. (73) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called (74) . (75) is another such technique that integrates data and process concerns into constructs called objects.

A．Structured analysis
B．Information Engineering
C．Discovery Prototyping
D．bject-Oriented analysis

水的三种形态是（）态，（）态和固态。